: He is most commonly associated with the "Mystery Man" sprite found in Room 269 of the Waterfall area when the game's "fun" value is set to 66. Wiki Undertale
Here is the critical difference:
"The ESP is clean. No lag, even in high-density servers. Finally, a hub that doesn't bloat my client." —
is a well-known exploit script hub primarily used in the Roblox game Slap Battles . It provides players with automated features and "cheats" to gain advantages that are otherwise difficult to achieve through legitimate gameplay. Key Features